This document discusses various biological hazards in food known as biohazards. It describes different types of biotoxins produced by living organisms like bacteria, fungi, algae, and plants that can cause food intoxication. Specific toxins are produced by organisms like Staphylococcus, Aspergillus, and Clostridium. These toxins can contaminate foods like meats, nuts, grains and cause illness. The document outlines the toxicity levels, symptoms and food sources of major toxins like botulinum, aflatoxin, ochratoxin and patulin. It emphasizes the importance of good agricultural practices, storage, handling and processing to control these biological hazards in foods.